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s 5 The screened intervals of the three wells are as follows: Well Casing Diameter Approximate Approximate Screen Number (inches)- Total Depth Interval FBG FBG MW-1 4 78 63-78 MW-2 4 78 63-78 MW-3 4 78 63-78 3 . 3 Well Development, Monitoring, and Sampling Monitoring Wells MW-1 through MW-3 were developed on April 3 , 1992 , by removing 10 casing volumes of water and until stabilization of pH, temperature, and conductivity parameters. The wells were monitored and sampled on April 6 , 1992 . Water levels in each well were measured to the nearest 0. 01 foot from the top of the PVC casing using an electronic sounder. A ground water elevation contour map based on interpretation of ground - water level and survey data (Table 1) is shown in Figure 3 . Prior to sampling, 3 casing volumes of water were removed from the wells and stabilization of pH, temperature, and conductivity was achieved. General field procedures for well development and sampling and field survey forms are presented in Appendix F. . Water samples were collected using a disposable bailer, transf arred into clean glass containers, and transported in an iced cooler to a California-certified laboratory for analysis. Well development and sampling procedures were conducted in accordance with RWQCB guidelines and SJCPHD requirements. 4. 0 ANALYTICAL METHODS Laboratory analysis was performed by Sequoia Analytical, a California-certified laboratory. Analysis of soil and ground water amples was performed using standard test methods of the United States Environmental Protection Agency (EPA) and the California Department of Health Services (Cal-DHS) , as discussed below. 4 . 1 Analysis of Soil and Ground Water Samples Soil and ground water samples were analyzed for the following: * TPH-G using EPA Methods 5030 and 8015G • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) using EPA Methods 5030 and 8020 . e TPH-D using EPA Methods 5030 and 8015D 3